What are some tips for creating and maintaining the oldest closed terrarium?

To create and maintain the oldest closed terrarium, follow these tips:

1. Choose a clear glass container with a tight-fitting lid.
2. Use a well-draining soil mix and add activated charcoal for filtration.
3. Select small, slow-growing plants that thrive in high humidity.
4. Place the terrarium in indirect sunlight and rotate it regularly for even growth.
5. Water sparingly to avoid excess moisture buildup.
6. Prune dead or overgrown foliage to maintain a balanced ecosystem.